Differential-phase reflectometry for edge profile measurements on Tokamak fusion test reactor

Journal Article · Sun Jan 01 00:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1146187· OSTI ID:6711521

Hanson, G R; Wilgen, J B; Bigelow, T S; Collazo, I; England, A C; Murakami, M; Rasmussen, D A; Wilson, J R ^[1]

---

1. Fusion Energy Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

Edge electron density profile measurements, including the scrape-off layer, have been made during ion cyclotron range of frequency (ICRF) heating with the two-frequency differential-phase reflectometer installed on an ICRF antenna on the Tokamak fusion test reactor (TFTR). This system probes the plasma using the extraordinary mode with two signals swept from 90 to 118 GHz, while maintaining a fixed-difference frequency of 125 MHz. The extraordinary mode is used to obtain density profiles in the range of 1[times]10[sup 11]--3[times]10[sup 13] cm[sup [minus]3] in high-field (4.5--4.9 T) full-size ([ital R][sub 0]=2.62 m, [ital a]=0.96 m) TFTR plasmas. The reflectometer launcher is located in an ICRF antenna and views the plasma through a small penetration in the center of the Faraday shield. A 26-m-long overmoded waveguide run connects the launcher to the reflectometer microwave electronics. Profile measurements made with this reflectometer system will be presented along with a discussion of the characteristics of this differential phase reflectometer and data analysis.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6711521
• Journal Information: Review of Scientific Instruments; (United States), Vol. 66:1; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TFTR TOKAMAK
PLASMA DIAGNOSTICS
ELECTRONS
ICR HEATING
MICROWAVE RADIATION
PHASE SHIFT
PLASMA DENSITY
REFLECTION
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
HEATING
HIGH-FREQUENCY HEATING
LEPTONS
PLASMA HEATING
RADIATIONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)